defdac;30937 said:
I will stick my neck out a little bit here.
There is one weak spot with EI and it seems to be the choice of micros. Many folks do weekly wc and dose one time per week. In this case 3 times a week which is a little bit better.
If you use a really good micro like the ones by Tropica you might be fine.
Why are the Tropica ones better, and that proven over and over again?
It seems to be the HEEDTA and cheap DIY-guys use EDTA/DTPA-based agriculture grade micros like CSM+B. In fact most aquarium fertilizers use EDTA/DTPA. Except Tropica. Many does not say at all which chelator they use. In Sweden we have found an agriculture grade micro named "Mikro+" which also is HEEDTA. Cheap alternative to Tropica.
Two plants that are extremely sinsitive to micro/iron-deficiency: Downoi (P. helferi) and HC. They eat so much iron it's down right ridiculuos.
The downoi you show is 100% micro limitied, most probably iron.
I bet my pants that if you start small daily dosages of a better micro nutrient everthing will start look better in matter of days.
Hey defdac, I'll take that bet, and I'll raise you a a pair of thermal underware. Everyone badmouths CSM+B and talks about how great TPN is at 50X the price. If truth be told I've tried both for weeks on end and I can't see a difference - and I've never seen anyone actually show the difference in a "micro shootout".
While I'll accept what you explain about the chelators I'm not convinced it makes that much of a difference compared to other factors in the tank. I'm a real cheapskate and I get the cheapest micros I can find, like the agriculture grade product here (if you're in the shop it's located two rows below the 25Kg bags of cow manure)=>
Chelated Trace Element Mix - £0.00 : The Garden Direct Store, Make the Most Of Your Garden
This is P. helferi on cheap DIY-guy EDTA/DTPA based micros:
Check this out:
Keep it real:
It's unlikely the damage shown in the OP's photos are attributable only to
low quality micro (in fact wasn't the micro mix Easylife profito?), especially when he reports dosing higher levels than standard. The only other difference I can see between CSM+B and TPN is that TPN has magnesium and CSM+B does not. But, this is no big deal as Mg is either abundant in the tap or it can be added via (cheap) Epsom's salts.
Additionally, the OP reports occurrences of Hair algae which is strongly correlated to poor CO2. That's not going to be a micro issue. As per popular trend it seems, high NO3 was blamed for the algae.
It's much more likely that the tank suffers from any combination of injection rate being too low, or gas ON timing being too late (if solenoid is used) or flow distribution being stagnant at the front substrate level.
A simple test would be to add or to increase Excel/Easycarbo dosing, assuming there are no fauna or other flora which react negatively to this, and/or to add more flow via pumps to direct flow to the front substrate. I've found that most cases of poor carpet plant performance is due to poor flow to the substrate or poor flow rate within the tank in general. If the symptoms are in fact due to a micro deficiency I reckon it's more probable that micros are not being
delivered properly to the plant instead of it being just due to cheap micro quality.
Big tanks are problematic due to loss of inertia in such a big space. An 80G tank is big and should get a flow "rating" of about 800 Gallon per hour or more if possible. Things that you can get away with in a small tank are unforgivable in a big tank, and THE cardinal sin in a big high tech tank is poor flow. Not only does the flow rate have to be high but the flow patterns need to be considered as well.
It's also not really clear how much the tank is being dosed. If one miscalculates the mixture then underdosing could easily be the culprit. The typical EI dosing levels for this size are as follows:
3X per week 1 teaspoon (6 grams) KNO3
3X per week 1/4 teaspoon (1.5 grams) KH2PO4
3X per week 2.5 teaspoon (13 grams) MgSO4
2X per week 3/8 teaspoon (1 gram) CSM+B or 20ml TPN (if you insist)
Since shrimp may be adversely affected by injection rate increase, it might be advisable to focus on flow improvement to deliver the nutrients/CO2 more efficiently. Massive flow cures a lot of problems in a big tank. It is entirely possible to have high CO2 which affects the fauna yet to have poor
distribution which stifles plant uptake.
Cheers,